If you loved Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread!, try Futari wa Precure Max Heart Movie 2: Friend of Yukizora
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread!

Futari wa Precure Max Heart Movie 2: Friend of Yukizora
What they share
Both films are directed by Junji Shimizu, and they both carry the cozy, playful mood tags, and they sit in Action / Adventure / Animation / Comedy / Family / Fantasy territory. If that's the register that drew you to Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread!, the second film will land in a comparable space — through a different lens.
What Futari wa Precure Max Heart Movie 2: Friend of Yukizora is
Aimed squarely at the younger anime fan, this one. Hikari finds a mysterious egg, which draws unwanted attention from the Dark Lord's henchmen. Cue battles and lessons learned. It's a decent entry for established fans of the franchise.